<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>mtlb_ifft</title>
  </head>
  <body bgcolor="#FFFFFF">
    <center>M2SCI function</center>
    <div align="right">Last update : 29/07/2004</div>
    <p>
      <b>mtlb_ifft</b> - Matlab ifft emulation function</p>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>Matlab <tt>
        <b>ifft</b>
      </tt> and Scilab <tt>
        <b>fft</b>
      </tt> behave differently in some particular cases:</p>
    <dl>
      <dd>
        <b></b>
        <dd>
          <li>
            <b>
              <font color="maroon"></font>
            </b>
        With one input parameter: If input is a scalar or vector Scilab equivalent for Matlab <tt>
              <b>ifft(A)</b>
            </tt>
	is <tt>
              <b>fft(A,1)</b>
            </tt> else if input is a matrix Scilab equivalent for Matlab <tt>
              <b>fft</b>
            </tt>
	is <tt>
              <b>fft(A,1,2,1)</b>
            </tt>
          </li>
        </dd>
      </dd>
    </dl>
    <p>
    The function <tt>
        <b>mtlb_ifft(X[,n,[job]])</b>
      </tt> is used by
    <tt>
        <b>mfile2sci</b>
      </tt> to replace <tt>
        <b>ifft(X[,n,[job]])</b>
      </tt> when it was not
    possible to know what were the inputs while porting Matlab code to Scilab. This function will
    determine the correct semantic at run time. If you want to have a
    more efficient code it is possible to replace <tt>
        <b>mtlb_ifft</b>
      </tt> calls:
    </p>
    <dl>
      <dd>
        <b></b>
        <dd>
          <li>
            <b>
              <font color="maroon"></font>
            </b>
        If <tt>
              <b>X</b>
            </tt> is a scalar or a vector
        <tt>
              <b>mtlb_ifft(X,1)</b>
            </tt> may be replaced by <tt>
              <b>fft(X,1)</b>
            </tt>
          </li>
          <li>
            <b>
              <font color="maroon"></font>
            </b>
        If <tt>
              <b>X</b>
            </tt> is a matrix
        <tt>
              <b>mtlb_ifft(X,1)</b>
            </tt> may be replaced by <tt>
              <b>fft(X,1,2,1)</b>
            </tt>
          </li>
        </dd>
      </dd>
    </dl>
    <p>Caution: <tt>
        <b>mtlb_ifft</b>
      </tt> has not to be used for hand coded functions.</p>
    <h3>
      <font color="blue">Authors</font>
    </h3>
    <dl>
      <dd>
        <b></b>V.C.</dd>
    </dl>
  </body>
</html>
